The influence of moment on body is determined by number of forces acting on body. It depend on magnitude of force. It also depends wher forces are collinear or not. Thus number of forces are not only parameter for determination of moment.

Simply, for equilibrium net force must be zero. That is forces must be collinear if equilibrium is to be established. And y must be in opposite directions. They also must be of same magnitude, cancelling each or.

The main moto of free body diagrams is to reduce calculation. The forces are simplified and couples too are simplified. This gives us total force and total moment acting on body. This gives us a single value of respective thing and hence reduces labour.

As 3D is defined as three axis system, we have to consider equilibrium in all three axis. This will make equilibrium go on all axis of 3D space. And hence will cancel all forces.

As vertical force means that force is going from outer to inner section of plate and horizontal force means that force is travelling along plane of surface. Thus by applying conditions for equilibrium we get above answer.

The simplification is easy. The simplified force system gives us a net force and parallel force system gives us a simplified force, and n we add it vectorially. Thus vector addition at last can be easily done and thus both can be simplified.

The requirement of second law is important in equilibrium of body. Specially rigid bodies. The rigid body particles are if are in motion n this law helps in making conditions for equilibrium of body. As when body will leave its state of motion and come in rest, etc.

The net moment of body is zero that doesn?t mean that distance between force and rotational axis is zero. This means moments caused by different forces cancels out. If this happens re is no motion of body along with any direction and hence body is said to be in equilibrium.

The summation of forces needs to be zero. So does summation of moments need to zero. But talking about angles, y not needed to zero. But forces which are acting at particular angles, must needed to be equal to zero. The basic need of forces to make body in equilibrium.

The summation of forces needs to be zero. So does summation of moments need to zero. But talking about angles, y not needed to zero. But forces which are acting at particular angles, must needed to be equal to zero. The basic need of forces to make body in equilibrium.